tirrill



A.- A. llRRI-LL. ELECTRICAL REGULATOR. APPLICATION FILED MARIE), I914.

1,194,683. j S Pa'tentedAug,15','1916.

WITNESSES: INV ENTQR 7 mm: mm. m. ummjwm. n. c.

UNITED STATESPATENT OFFICE. I

ALLEN "A. 'rinmmjor PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSELECTRIC AND MANUFACTURING COMPANY, A CORPORATION or PENNSYLVANIA.

, ELECTRICAL REGULATOR.

Specification of Letters Patent.

Application filed March 3, 1914. Serial No. 822,132. I

T all 107mm it may concern: I

Be it known that I, ALLEN A. Tnuunn, a citizen of the United States, anda resident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in ElectricalRegulators, of which the following is a specification.

My invention relates to electrical regulators, and particularly to thosein which the regulation is effected by opening and closing a shuntcircuit to a resistance in circuit with the field magnet winding of anexcitcr or other dynamo-electric machine.

The object of my invention is to provide a regulator of the characterindicated that shall be 'efiective, reliable and accurate in operation.

In the single figure of the accompanying drawing, which diagrammaticallyillustrates a system of distribution embodying my invention, anelectrical generator 1 supplies current to a suitable distributingcircuit 23-4, and a field magnet winding 5 of the generator is suppliedwith current,

from exciter bus bars 6-7. An exciter 8 that 1s connected to the bus-burs 6 is provided "ii/l1 a field magnet winding 9'in cirunit with which18 a suitable variable res The relay 13 is provided with an ener gizingwinding 14 that 18 connected in parallel with a similar energizingwinding iii of another relay l6, and that is supplied with current fromthe exciter bus bars 6-7, or that may be supplied. from any othersuitable source. The circuit of the windings 1t and 15 is controlled bya 'pair of cooperating stationary and movable contact terminals 17 and18, res iectively, the former of which is res'iiientl l iiuounted as,for in: stance, by being attached to the free end ot a plate spring 19.The contact member 18 is carried by a lever 20 that is actuated by anelectromagnet comprising a, core 21 and an energizing winding 22, theclrcmt of said ,avinding being controlled by contact terminals 23 and2st of the relay 16. The n'iovcments of the contact terminal 18, thelever 20 and the core 21, are retarded by means of a dash put 25.

The attractive force of the winding 22 opposed by'a spring 26. the endsof which are respectively attachedto one end of the lever 20 and toanother lever 27 at one side of its pivotal point; The lever 27 isactuated by means of an electromagnet .comprising a core 28 and anenergizing windlng 29, its movements being retarded by means of a dashpct 30. A counterweight 31 is provided at'the opposite end of the lever27 to that to which the core 28 is uttached, and the combined. effect ofthe sprinwlfi and the counterweight 31 is to slightly overbalance theweight of the 'core 28. The variatii'ms of the position of the lever 27that are caused by the winding 29 serve to vary the force exerted by thespring 26 upon the lever 20, or, in other words, the i'orce opposed tothe attraction of the winding 22.

The winding 29 receives current from the distributing circuit-23t,though, it desired, it may receive current from any other suitablesource. The degree of encrgization of the winding 29 is controlled bymeans of a relay 33 comprising a. pair of cooperating stationary andmovable contact members 23+ and 35, respectively, the former of which ispreferably resiliently mounted as by being attached to the free end of aplate spring 36. The contact terminal 35 is carried by a lever 37 havinga spring 38 at one end tending to separate the contact terminals 3% and35, and an electromagnet at its other end, the core member 39 of whichis attached thereto. The core member 39 is surrounded by energizingwinding 40 that receives current proportional to the voltage of thedistributing circuit The position of the contact terminal 35 isaccordingly varied, causing it o vib ate into and out of engagement withthe terminal 34:, in accordance with variations of the voltage of thedistributing circuit, though, if desired, its position may be varied inac.-' cordance with the variation of any other electrical condition ofthe circuit or system.

If, during the ope 'ationot' the system, the load upon the distributingcircuit -2-3-i increases'to such an eXtenta-s to Iatented Aug. 15, 1916.i

' greater force is then exerted upon the spring 26, which tends to causethe contact terminal 18 to engage the terminal 17'. Upon engagement ofthe contact terminals 17 and 18, the circuit of the coils 14 and 15 isestablished, and the contact terminals of the relays 13 and 16 arebrought into engagement. The engagement of the contact terminals lland12 shunts the exciter field resistor 10 with 'the result that theexciter and generator voltages are somewhat increased. Engagement of thecontact terminals 23 and 243%- tablishes the circuit of the coil 22,which thereupon separates the contact terminals 17 and 18. Uponseparation of the contact'terminals 17 and18, the circuit of'the' coil22 is again interrupted and the said coil, therefore, serves inconjunction with the spring 26 to vibrate the contact terminal 18 intoand out of engagement With the terminal 17. The relation of the periodsof engagement and disengagement of the said contact terminals isdetermined by the force exerted by the spring 26 which, in turn, isdetermined a by the coil 29. The degree of energization of the winding29 is determined by the relay 33, the operation of which is governed bythe voltage or other electrical condition of the distributing circuit.Consequently, the relation of the periods of engagement anddisengagement of the contact terminals 17 and 18 ultimately depends uponthe voltage or other electrical condition of the circuit 234.' Thearrangement is such that,

'- when the voltage upon the circuit 23l said lever, a second lever,

the said resistor will be shunted for a longer average period. I

I claim-as my invention: 1-. An electrical regulator comprisingoperating stationary and movable contact members, a lever carrying themovable .con-

tact member, an electromagnet for actuating resilient means in-'terposed between the two levers and constituting the sole means wherebyone may actuate the other, and means for actuating the second lever inaccordance with variations of the quantity regulated.

2. An electrical regulator comprisingco-' operating stationary andmovable contact members, a lever carrying the movable'contact member, anelectromagnet foractuating said lever, a second lever, resilient meansinterposed between the two levers and constituting the sole meanswhereby one may actuate the other,'an electromagnet for actuating thesecond lever, and a relay for-controlling the energization of the saidelectromagne't in accordance with variations of the quantity regulated.

In testimony whereof, I have hereunto subscribed my name this 20th dayof Feb,

ALLEN A. TIRRILL. WVitnesses 4 Orro S. SCHAIVER,

B. B. Hmns.

